Lucas Oil Hydraulic Oil Booster STO - 1 Qt Seal Conditioner, Leak Stopper & Temperature Reducer

Lucas Oil Hydraulic Oil Booster/STO is an additive that conditions seals, restores lost hydraulic pressure, reduces operating temperatures and helps stop leaks in older or worn hydraulic systems.

Designed as a cost-effective preventative and corrective treatment, Hydraulic Oil Booster/STO works with both synthetic and conventional hydraulic fluids. It’s formulated to rejuvenate hardened seals and O-rings, improve lubricity, dissolve varnish deposits and reduce frictional heat, helping extend component and fluid life without a full system overhaul. Use it when systems show slipping, chatter, rising temperatures or reduced pressure.

How does this product stop hydraulic leaks and extend seal life?

Hydraulic Oil Booster/STO contains conditioners that soften and swell aged rubber components, helping seals and O-rings regain flexibility to seat better and reduce seepage. Over time seals harden and crack—this formula helps delay replacement by restoring function and preventing new leaks from forming.

• Penetrates and conditions old seals and O-rings to reduce shrinkage and leakage
• Compatible with common elastomers used in hydraulic systems
• Useful as a temporary fix while scheduling repairs or parts

Will it improve hydraulic pressure and performance in worn systems?

Yes—by removing varnish and restoring internal clearances, the booster helps pumps and valves regain more efficient pressure delivery. Restored pressure reduces slipping and chatter, giving older equipment noticeably better responsiveness without immediate major repairs.

• Helps clear varnish and soft deposits that restrict flow and pressure
• Boosts lubricity to reduce internal leakage and improve pump efficiency
• Can restore near-original pressure in many worn systems when used as directed

Does it lower operating temperature and protect components?

The additive increases lubricity and reduces friction between moving parts, which lowers heat generation during normal operation. Cooler running temperatures help hydraulic fluid last longer and decrease wear on hoses, rams and cylinders.

• Reduces friction and helps cut operating temperatures under load
• Extends hydraulic fluid life—often up to twice as long in many service conditions
• Helps protect hoses, seals and moving parts from premature wear

How and where should I use Lucas Oil Hydraulic Oil Booster/STO?

It is suitable for industrial, mobile and agricultural equipment that uses conventional or synthetic hydraulic fluid, including systems with wet brakes. Add the recommended dose directly to the hydraulic reservoir during routine maintenance or when symptoms appear; always follow the equipment and product dosing instructions.

• Safe for use in systems with wet brakes when used according to directions
• Works in both synthetic and conventional hydraulic fluids
• Ideal for preventive maintenance and as a repair-delaying treatment

Who is this for? Lucas Oil Hydraulic Oil Booster/STO is aimed at fleet managers, equipment owners and maintenance technicians who want a budget-friendly way to restore performance and reduce downtime in older or heavily used hydraulic systems. It’s a practical choice when you need to stop leaks, improve pressure and lower operating temperatures without removing components for immediate replacement.